Simple application - Weaver No Gunsmith Shotgun Systems

had this mounted on my 870 in about 15 min, mounted the scope, shot a target 25 yds away, made the adjustment for getting a group 1/2 in high, moved to 100 yds using 3in Mag loads, sabot rounds, made one adjustment shot my group, move to 200 yds fired 2 3 shot groups, one group was somewhat spread out, made adjustment, second group was a 3 in group. From start to finish, I had an hour of time invested total. would recommend this mount to everyone